Abstract：To solve the problems in driving of long cold-formed steel sheet piles such as difficulties in pile driving and easy
distortion and deformation of piles，this paper derives, on the basis of theoretical analysis, a formula to calculate the maximum
vertical length of a slender piles under its own weight and a formula to calculate the exciting force that a pile can withstand，
which provides theoretical basis for selection of construction process for extra-long steel sheet piles and which has been veri原
fied in the construction of a cofferdam for a ship-repairing dock. The problems in driving of long cold-formed steel sheet piles
was then solved the problems and the working efficiency was improved.